The child has been identified as Adam Herrman, who was 11 years old when he was last seen in 1999. The boy's parents claim he ran away.

Investigators with the Butler County Sheriff's office searched the Pine Ridge mobile home park south of Towanda Wednesday. Sheriff Craig Murphy said the lot they focused on used to have a mobile home where the boy lived with his parents. It is an empty lot now.

Adam's adoptive mother tells KAKE News he joined their family before he was three years old and he was one of three adopted children. She claims he suffered from mental problems and had a history of running away. The family moved away from the Butler County park in December of 1999 when she lost her job as park manager. Adam was never reported missing by his family.

The sheriff's department is holding a news conference at 10 a.m. Monday. Murphy said they've been working on the case for about three weeks, but wouldn't say what caused them to open the case or whether or not they believe the person they are looking for is alive or not.

Investigators said they did find a piece of information on the lot as they searched Wednesday that gave them some answers, but they would not say what they found.

Adam's family says they are contacting an attorney and plan to release a formal statement to the media soon.